HD404618 Datasheet, PDF (43/91 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

HD404618 Series
Table 20 Programmable I/O Circuits
PMRB Bit 3 (PMRB3)
0
1
DCR
0
1
0
1
PDR
0
1
0
1
0
1
0
1
CMOS Buffer
PMOS (A) —
—
—
On —
—
—
On
NMOS (B) —
—
On —
—
—
On —
Pull-up MOS Transistor
—
—
—
—
—
On —
On
Notes: 1. —: Off
2. Various I/O methods can be selected by different combinations of settings of the above mode
registers (PMRB3, DCR, PDR).
3. The PMOS (A) transistor of the R1₂/SO pin can be turned off by setting bit 2 of the miscellaneous
register (MIS) to 1.
MIS
Bit 2
0
1
R0₂/SO Pin
PMOS (A)
On
Off
4. The relationships between DCRs and pins are as shown below.
DCR
DCR0
DCR1
DCR2
DCR3
DCRB
DCRC
DCRD
Bit 3
R0₃
R1₃
R2₃
R3₃
D₃
D₇
—
Bit 2
R0₂
R1₂
R2₂
R3₂
D₂
D₆
—
Bit 1
R0₁
R1₁
R2₁
R3₁
D₁
D₅
D₉
Bit 0
R0₀
R1₀
R2₀
R3₀
D₀
D₄
D₈
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